Appeal to trace mother of girl assaulted on train
Police want to trace a woman who claimed her daughter was "inappropriately touched" on an East Coast Mainline train.
The woman, believed to be Chinese, got off the train at Grantham after telling another passenger about the assault, but did not contact police.
Officers are linking the claim to nuisance behaviour on the train, over which a man was arrested.
Anyone with information about the 11 April assault should contact police.
The incident took place on the 1903 BST London King's Cross to Leeds service.
After the woman got off the train, other passengers alerted British Transport Police about a man causing "alarm and distress".
Officers boarded the train at Doncaster, where a 42-year-old man from east London was arrested and issued with a fixed penalty notice.
PC Saleh Ali said: "It is vital that the victim and her mother comes forward and helps officers in our investigation.
"Whilst this type of incident is rare on the rail network, officers are treating it very seriously."